DBU and copper(I) mediated carboxylation of terminal alkynes using supercritical CO2 as a reactant and solvent
作者:Fa-Wang Li、Quan-Ling Suo、Hai-Long Hong、Ning Zhu、Ya-Qi Wang、Li-Min Han
DOI:10.1016/j.tetlet.2014.05.024
日期:2014.7
8-Diazabicyclo[5.4.0]undec-7-ene)-mediated and copper(I)-catalyzed CH activating carboxylation of terminal alkynes in supercritical CO2 (ScCO2) was developed in this work. Terminal alkynes react with ScCO2 in the presence of CuI/DBU and produce the corresponding functionalized propiolic acids in excellent yields. Under the optimized conditions, carbondioxide can act as both reactant and solvent for the
A series of new heteroleptic ferrocenyl dirhodium(II) complexes has been prepared and used to catalyse the intramolecular decomposition of a diazo substrate. Redox tuning of chemoselectivity was possible, as the aromatic substitution/aliphatic C−H insertion ratio increases upon oxidation of the ferrocenyl moiety, in electronic communication with the Rh centre.